초록 ▼

A method for powder metallurgical production of bar stock from an iron, nickel or cobalt based alloy comprises the steps of introducing a powder of the desired alloy into a tubular container together with a reducing agent and an oxygen getter, sealing the container without evacuating it, heating the

A method for powder metallurgical production of bar stock from an iron, nickel or cobalt based alloy comprises the steps of introducing a powder of the desired alloy into a tubular container together with a reducing agent and an oxygen getter, sealing the container without evacuating it, heating the sealed container and the powder therein, compacting the heated container by progressive forging and rolling the forged blank. Equipment for forging the container includes a tool having upper and lower dies defining between them an open-ended forging cavity which tapers from an entrance end towards an exit end and through which the container is fed in step-wise manner.

대표청구항 ▼

A method for producing from a powder of alloys based on iron, nickel or cobalt bar stock having low porosity and good particle bonding, comprising the sequential steps of providing along the inner side only a hollow capsule an oxygen-affinitive reducing material having the ability to bind oxygen to

A method for producing from a powder of alloys based on iron, nickel or cobalt bar stock having low porosity and good particle bonding, comprising the sequential steps of providing along the inner side only a hollow capsule an oxygen-affinitive reducing material having the ability to bind oxygen to itself more firmly than has the metal which is the predominant constituent oF the powder particles, filling the capsule with the powder and an oxygen carrier to constitute a powder mass in the capsule, hermetically sealing the capsule and compacting the powder mass in the capsule by progressive forging of the capsule at a temperature in the range of 900°-1200°C, whereby a blank is formed and the oxygen carrier combines with oxygen in the powder mass to form a gas which is transported towards the inner side of the capsule and reacts there with the oxygen-affinitive material and removing the capsule from the blank.